Troubleshooting

In this section, you will find a wide range of troubleshooting for Master Manufacturing spot and broadcast sprayers. If you have further questions in regards to troubleshooting your Master Manufacturing sprayer, please reach out to our team at 320-340-6464 or send us an email via our Contact page.

NOTE: Before servicing your sprayer always wear protective gear, empty & flush tank, and disconnect the power to the sprayer.

Master Gardener (PCD-03-009B-MM) Has No Power + -

There is a few possibilities that would explain why the Master Gardener sprayer isn’t powering up. Here are some causes and solutions.

  • Battery isn’t fully charged. Charge the battery.
  • Ensure power switch is in the “on” position.
  • Check if all electric connections are tight.
  • Inspect fuse located in back of sprayer.
  • Check to make sure pump has power.

For a more in-depth step by step process, watch our video on Troubleshooting the Master Gardener.

Sprayer Is Having Suction Issues + -

If your Master Manufacturing sprayer is having issues sucking up water from the tank, your inlet strainer could be covered in debris. Cleaning the debris off would allow your sprayer to regain the proper suction needed.

For a more in-depth step by step process, watch our video on Troubleshooting Your Inlet Strainer.

Replacing A Valve Plate Assembly On Diaphragm Pump + -

If your diaphragm pump on your Master Manufacturing sprayer is leaking, not turning on, or providing low flow; it might be time to replace your diaphragm valve plate assembly.

For a more in-depth step by step process, watch our video on Replacing Your Diaphragm Valve Plate Assembly.

Diaphragm Pump Runs While Not Spraying + -

There is a few underlying issues that could cause why your diaphragm pump is running. One issue is the pressure switch going bad. You can determine if the pressure switch is bad by bypassing the connection to the pump.

For a more in-depth step by step process, watch our video on Bypassing the Pressure Switch.

Force Priming A Sprayer + -

There may come a point where you need to force prime your sprayer pump.

For a more in-depth step by step process, watch our video on Force Priming A Pump.

Sprayer Pump Will Not Turn On + -
  • Bad Electrical Connection – Verify connections are tight and battery posts are free of corrosion.
  • Short in Wires – Check condition of wire insulation and replace if gaps or holes are present..
  • Locked Drive – Replace the diaphragm assembly.
  • Faulty Pressure Switch – Replace the pressure switch assembly.
  • Incorrect Voltage – Check voltage and verify within range ±10%.
  • Fuse Blown – Check and/or replace the fuse.
Sprayer Pump Will Not Prime + -
  • Out of Product (Fluid) – Refill the supply container/sprayer tank.
  • Inlet Air Leak – Tighten the hose fittings and/or replace cracked fittings.
  • Inlet/Outlet Tube Restriction – Remove any restriction from the inlet or outlet tubes.
  • Incorrect Voltage – Check voltage and verify within range ±10%.
  • Clogged Intake Valves – Remove obstruction from valves.
  • Clogged Intake Tube – Remove obstruction from tube.
Low Pressure or Flow + -
  • Worn Spray Gun Nozzle – Replace spray gun.
  • Worn Boom Nozzle – Replace boom nozzle.
  • Worn Wobble or Diaphragm Plate – Replace the diaphragm assembly.
  • Worn Pressure Switch – Replace pressure switch assembly.
  • Inlet/Outlet Tube Restriction – Remove restriction.
  • Incorrect Voltage – Check voltage and verify within range ±10%.
  • Clogged Intake Valves – Remove obstruction from the valves.
  • Clogged Intake Tube – Remove obstruction from the tube.
  • Inlet Air Leak – Tighten loose fittings, replace cracked fittings.
Pump Leaks + -
  • Loose Fasteners – Tighten fasteners and hose clamps.
  • Pump Seals Degraded – Replace the pump head assembly.
  • Leak in Diaphragm – Replace the diaphragm assembly.
Poor Spray Distribution + -
  • Clogged Intake Tube – Remove obstruction from the tube.
  • Clogged Suction Strainer – Clean suction strainer.
  • Worn Spray Gun Nozzle – Replace spray gun.
Pump Cycles While Not Spraying + -
  • Leak In the System – Tighten leaking hose clamps, fittings or replace spray gun.
  • Faulty Pressure Switch – Replace pressure switch.
  • Incorrect Voltage – Check voltage and verify within range ±10%.
  • Air Trapped in System – Purge the air from the system.
Rough Operation + -
  • Flexible Mounting Surface – Install your pump on a rigid mounting surface.
  • Loose Pump Head – Tighten fasteners.
  • Compressed Base Feet – Decompress base feet.
  • Rigid Plumbing – Replace rigid plumbing with flexible hoses.
Broadcast Boom Doesn't Spray + -
  • Bad Electrical Connection – Check battery connections.
  • Boom Shut-Off Valve – Flip “on” shut-off valve.
Irregular Broadcast Spray Pattern + -
  • Clogged Strainer – Unclog strainer.
  • Pinched or Clogged Hose – Unpinch or unclog hose.
  • Clogged Nozzles – Unclog nozzles.
  • Damaged Spray Nozzles – Replace nozzles.
  • No Nozzles In Boom – Install nozzles into boom.
  • Incorrect Nozzle Size – Replace with correct nozzles.
  • Nozzle Facing Wrong Direction – Adjust nozzle to correct designation.
Boom Leaks + -
  • Loose Fasteners – Tighten fasteners.
  • Loose Connection To Shut-Off Valve – Tighten boom to shut-off valve.
  • Damaged Boom Hose – Replace hose or boom kit.
Nozzles Drip After Use + -

No Ball Check Strainers – Install ball check strainers.